When wind speeds reach 39mph, it becomes a named storm and would be called Nate.
If it reaches tropical storm strength, Sixteen would become the 14th named storm of 2017.
A more northerly motion is forecast heading into the weekend.
"In all likelihood, this storm will impact areas not severely impacted by Harvey or Irma. The fuel is really there to get this storm to intensify quickly". Then rain becomes more likely Sunday, mainly over the eastern half of the state.
If the weaker wave moves north over the Florida peninsula, Invest 90L could take a more northeasterly track into the eastern Gulf, forecasters said.
Offshore rigs and platforms in the Gulf of Mexico account for about 17 percent of US crude oil output and 4.1 percent of gas production.
On average, the Atlantic Basin, which includes the Caribbean and Gulf, experiences two of them annually from October 4 on. In Honduras, the government has issued a Tropical Storm Warning for the coast of Honduras from Punta Castilla eastward to the border with Nicaragua.
This heavy rainfall could cause life-threatening flash floods and mudslides, according to the NOAA.
A strong ridge in place across the eastern half of the USA keeps the weather in Alabama, dry, very warm, and mainly clear.
Areas from the U.S. Gulf Coast to Central America and the islands in the central and western Caribbean will experience rounds of showers and thunderstorms, due to a broad area of disturbed weather over the next couple of weeks.
Vertical wind shear, which can disrupt storm development, is not high - another factor in the system's favor. However, as it travels to the northwest to north by the end of the week, it may enter a patch of warm waters in the southern Gulf. This is not an official forecast, but the models are often used as guidance for creating the projected path for a storm.
There's a little under two months left in this year's hurricane season, which ends November 30.
Including Maria, there have been 13 tropical storms, eight hurricanes and four major hurricanes thus far.
The sea surface temperatures, which serve as fuel for tropical weather systems, are very high from the southwest Caribbean to the Yucatan Channel and into northeastern Gulf of Mexico - generally 0.5 to 2 degrees above normal.